Shoe sewing machine



Dec. 22, 1931. A. F. CARLSON SHOE SEWING MACHINE Filed March 31, 1928 2Sheets-Sheet ZnvenTor. Axel F Cuflson b Qm nb KWzo 1 Dec. 22, 1931. A.F. CARLSON 1,337,757

SHOE SEWING MACHINE Filed March :51, 1928 2 Sheets-Sheet 2' Fig.2.

\n enTor. Axe\ F Zurson X ATTyS.

Patented Dec. 22, 1931 NI ED-STAT S PAT-ENTFOFFICE'F' AXEL FOLKECARLSON, 0F CAMBRI GE; MASSACHUSETTS, Assre'non TO nnncn snow MACHINERYcomamr, or nosrron, MASSACHUSETTS; 'A' CORPORATION or MAINE snonlsnwmeMACHINE Application filed March 31,1925. Serial no. 266,421.

V This invention relates to shoe sewing machines, and more especially tothe control or .regulation of the thread and the application andvariation of tension thereon. Machines of the class to which the presentinvention is applied are exemplified by the Reece weltand-turn machinewhichis a power driven stitching machine in'which the upper of a boot'orshoe is stitched to the lip of the insole, and frequently to a weltstrip. Inp I x the right, taken substantially" on the line stances ofsuch machines are those illustrated in patent of Zaleski and Schoenky'No.

1,288,366offDeceit1ber 17,- 1918, and subsequent patents,- such as thepatents of J. B. Oliver 1,605,060 of November 2, 1926 ,and

Patent 1,688,938 of October 23, 1928,wherein chain stitches are appliedby the use of a curved hooked needle and cooperating instruments. areapplicable to other types of shoe or 18311111 er stitching machines.

Th" general ob]ect of the present invenfill the hereinafter followingdescription .of

an illustrative embodiment thereof or will be apparent to those skilledin the subject.

To the attainmentoftherecited objects and advantages the present'invention consists in the'novel shoe sewing machine, and threadtensionmechanism,..and the novel features of combination; arrangementand structure hereinillustrated or described. 7

" lfn the accompanying drawingsFig-l right elevation ofa su cientpart ofa Reece welt sewing machine to illustrate in connec The novel featureshereof however is. a-

tion with the other figures the principles of the present invention I tFig. 2 is a top plan view offthe charac'-' teristic portions of themechanism. Fig. 3 is a vertical section, looking froms 5 the front,taken substantially on the line .33 of Fig. 2.

Fig. dis a face view of the threadwheelshown in the other figures.

Fig. 5 is a vertical section,

I looking from 5 -5 of Fig. 8. V

"Similar reference numbers are appliedto corresponding parts intheiseveralfigures of the drawings. j Referri'ngto Fig. 1' there isindicated a shoe in sewing position. Surrounding the last Zis the insoles'with its outturn'edlips',

the shoe upper u, and the'welt strip a) being fed andattached by threadt to the upper and.

insole lip. g ,The machine may comprise the usual tall post 9 at theupper endof which is a suitable head or frame including fore-and-aft 7frame 'walls 10 and 11, beingthetw'o' usual frame 7 walls giving supportto the'mechanism of this invention. The stitching shafth13 is shown asturning inthe frame walls inconv unction With other usualjbearings.

The thread-t, which ay com-e'froin a wax 8 0 pot atthe rear passes firstto the thread wheel,

'14 around which the thread travels subject to the restraining action ofthe tension control or device to be described. The thread, from thetension, passesto va takeup lever 15 v and thence to the usuallooper 16operated to' applyaloop of the wax thread to the barbed point of theneedle 17, successive stitches thus being formed, while between'stitches, the Work is fed forwardly by the usualreciproeating feed'pointor device 18. ;The shoe is shown held to positionagainsta work rest 119, intermittently yieldable, and'itbearsalsoja against a welt guide 20supported .onfa car {9 rier 21, which 7 also may I :be intermittentlyyieldable. Above the welt guide and'carrier is shown a'series ofinechanical parts for controlling the movements thereof during,

stitching, but these will*not be" described r as herein, as they form nopart of the present invention.

Coming now to the tension mechanism, the

preferred operation of; the presentinvention is that two separateresistances to the thread wheel orthread are provided, one quite'heavyandv amounting to a locking action, the other much'lighter, thesenormally being both in eifect,.but the heavy resistance or friction be-10 ing. released or removedintermittently, that is atgthe properpointiin: each stitchqcycle,

while the light tension remains in effect throughoutthe stitching; andthe-tension preferably being operated so that at the end of thestitchingynot only the: heavy tension" 7 but the light tension ,i sremoved, thus leav- "ing the thread'free to bedrawn from the supply.with the removalofthe work from the machine.

The thread wheel'l l ,hub -turnin'g on. an: axle 26', and the hub 1carrying also "a friction drum 27 through two separatefriction membersor shoes, a

which resistance or friction canibe applied to the thread wheel andthread. 7 I

; Bearing, on the tension drum 27 are shown rear 'friction'shoe hereinemployed'for the light tension, andafront shoe 31, herein 'showndirectly beneath the axle .26.] The. stud 3.3 is supported on a fixedbracket34 as shown in Fig. 3, this being a .portion; of a :and'an upperportion forming a bearing, for part 51.to be described, and-a portion 7wall 11, as seen in Fig. The rear or light tension employed for the highor heavy tension; each friction shoe having a friction; facing 32. For;convenience both of the friction shoes maybe fulcrumed on the same stud33 more extended bracket, having a portion 35 which extends around andabove the axle 26 37 which is-attached: rigidly to the frame shoe30 isam as applied by a spring, 38, this spring surrounding an interior rod39' having its rear end threaded to'carry an adjusting nut 40 and alocknut 4:1,bywhich, the spring pressure can be exactly adj usted'to thelight ten ,forinedon the :fixedlfbracket' member 37; Thereby the forwardend of thetension rod "39' is held stationary; subject to rocking mofTheheavy tension is applied by a front tion, while the rear end carries theadjusting n'u'ts40and4. r

' spring, surrounding'arod 46 carrying at its-freeorfforflward end a nutet'land lock :nut 418,-the rearor inner end of the rod 46 s {having aneye surrounding the fixedstud 42. The .lnuts 47jan'd. 48'will beadjusted to give the desired powerful resistance and heavy tension.

1 The frontor heavy tension shoegl be is shown ashavinga relaxed orreleased intermittently by means v of a rocker or finger 50, j which isshown mounted on a rock shaft'51 supported in the bracket portion 36.The finger is at the left end ofthe rock shaft and at its right end itcarries a hub 52 formed into a rock arm 53 carrying acam roll 54.. Theseelements shown in full lines in F igs; 2 and 3 are indicatedin dottedlines in Fig. 1 where the rock arm 53 is shown pressed-by ajspring55sothatthe" cam roll 54 bears against'theiperlphery of a cam 56 mountedon, the stitching shaft 13. The cam is shown as having an eccentricportion 57 allowing the cam'roll to move for 'wardly and thusi apply theheavy tension.

In the position shown in F ig. 1 the heavy tension is inmefi'ect; Aftera further rotation the eccentric cam portion 58 will come into thusswingthe rock finger 50'to pressforwar'dlythe shoe 31 and thus releasethe heavy tension. 7 i

effect to lift'thecam roll rearwardlyand The flight orrear tension shoe30 isarranged to be retracted or released at the end of the stitching ofa seam. A pin 60 is shown which takes a doubly curved shape'to clear"located slightly in front of the upper portion of the shoe. This pin iscarried onfa lever 61" the adjacent parts and has a hub 62 turningloosely onthe axle 26. The lower extension of the lever 61 isconnected'by a link 63 with a 'rock lever 64 turning on a fulcrum stud65,

the other arm of this ro'ck lever carrying a pin' 66 engaged in theslotted upper'end of a. connecting rod 67 the lower end of-which ispivotedto a collar 68 mounted ona verticallymoving member or rod 69which may be the-usual pedal rod, or at leastarranged to moveup'wardlywhenthe pedal-is let up in the final stoppage of the machine, the slot.between elements 66 and 67 preventing the operation of this train ofmechanism until thepedal has been letclear up. The operation at thispart of the mechanism. is that afterthe completion of the stitch;

ing thepedal is let up to discontinuethedrive,

' usually to applya stopmotion, and through the elements 61 to 69caus'es' the rearward f swinging of the pin 60toremove and'relea'setherear or light tension shoe. T Whenthe machine is in the position inwhich' it comes to'a final stoppage the front or heavy tension shoe willalso have beenj withdrawn,

and-thusjalltension and resistance on the thread wheel and thread willhavebeen re:

be pulled'fromthemaohine; V

1120" moved, leaving theshoeand thread free to 1 f-There' has thus beendescribed a'shoe sewing machine embodying tension mechanism Constructedand 'operatingin accordancew th the principles l of the present .,}-1invention.

Since many matters of combinatiomarrangeiment and structure may bevariouslymodified 1 7 without departingfrom theprinciples hereof o it isnotintended'tolimiti-theinvention 02136 such matters except so far asset forth-in the appended claims.

What is claimed is:

1. In a power driven shoe sewing machine, in combination with the needleand take up and cooperating stitch forming and work feeding means, athread control means comprising a thread wheel between the thread supplyand take up, and a brake drum turning with the thread wheel, a firstperipheral brake shoe at one side of the drum for applying intermittentresistance to the thread wheel, a second peripheral brake shoe at theother side of thedrum for applying continuous resistance thereto, saidbrake shoes being both pivoted at the same side of the brake drum andeach having an extension at the opposite side of the drum, with springmeans normally acting on said extensions to apply both said shoes to thedrum, and timed means acting to remove the first brake shoe atpredetermined points in each stitch cycle.

2. In a power driven shoe sewing machine, in combination with the needleand take up and cooperating stitch forming and work feeding means, athread control means comprising a thread wheel between the supply andtake up, and a brake drum annexed there the drum, adjusters therefor,and means operating in each stitch cycle to remove the pressure of thefirst brake shoe and compress its spring.

In testimony whereof, I have aifixed my I signature hereto.

AXEL F. CARLSON.

